u_draw_quad.c revision 0f00786868720d8b56bdf31cb28ece7590b16809
1/************************************************************************** 2 * 3 * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas. 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sub license, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial portions 16 * of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. 21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR 22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 **************************************************************************/ 27 28 29#include "pipe/p_context.h" 30#include "pipe/p_defines.h" 31#include "util/u_inlines.h" 32#include "util/u_draw_quad.h" 33#include "util/u_memory.h" 34#include "cso_cache/cso_context.h" 35 36 37/** 38 * Draw a simple vertex buffer / primitive. 39 * Limited to float[4] vertex attribs, tightly packed. 40 */ 41void 42util_draw_vertex_buffer(struct pipe_context *pipe, 43 struct cso_context *cso, 44 struct pipe_resource *vbuf, 45 uint offset, 46 uint prim_type, 47 uint num_verts, 48 uint num_attribs) 49{ 50 struct pipe_vertex_buffer vbuffer; 51 52 assert(num_attribs <= PIPE_MAX_ATTRIBS); 53 54 /* tell pipe about the vertex buffer */ 55 memset(&vbuffer, 0, sizeof(vbuffer)); 56 vbuffer.buffer = vbuf; 57 vbuffer.stride = num_attribs * 4 * sizeof(float); /* vertex size */ 58 vbuffer.buffer_offset = offset; 59 60 /* note: vertex elements already set by caller */ 61 62 if (cso) { 63 cso_set_vertex_buffers(cso, 1, &vbuffer); 64 cso_draw_arrays(cso, prim_type, 0, num_verts); 65 } else { 66 pipe->set_vertex_buffers(pipe, 1, &vbuffer); 67 util_draw_arrays(pipe, prim_type, 0, num_verts); 68 } 69} 70 71 72 73/** 74 * Draw screen-aligned textured quad. 75 * Note: this isn't especially efficient. 76 */ 77void 78util_draw_texquad(struct pipe_context *pipe, struct cso_context *cso, 79 float x0, float y0, float x1, float y1, float z) 80{ 81 uint numAttribs = 2, i, j; 82 uint vertexBytes = 4 * (4 * numAttribs * sizeof(float)); 83 struct pipe_resource *vbuf = NULL; 84 float *v = NULL; 85 86 v = MALLOC(vertexBytes); 87 if (v == NULL) 88 goto out; 89 90 /* 91 * Load vertex buffer 92 */ 93 for (i = j = 0; i < 4; i++) { 94 v[j + 2] = z; /* z */ 95 v[j + 3] = 1.0; /* w */ 96 v[j + 6] = 0.0; /* r */ 97 v[j + 7] = 1.0; /* q */ 98 j += 8; 99 } 100 101 v[0] = x0; 102 v[1] = y0; 103 v[4] = 0.0; /*s*/ 104 v[5] = 0.0; /*t*/ 105 106 v[8] = x1; 107 v[9] = y0; 108 v[12] = 1.0; 109 v[13] = 0.0; 110 111 v[16] = x1; 112 v[17] = y1; 113 v[20] = 1.0; 114 v[21] = 1.0; 115 116 v[24] = x0; 117 v[25] = y1; 118 v[28] = 0.0; 119 v[29] = 1.0; 120 121 vbuf = pipe_user_buffer_create(pipe->screen, v, vertexBytes, 122 PIPE_BIND_VERTEX_BUFFER); 123 if (!vbuf) 124 goto out; 125 126 util_draw_vertex_buffer(pipe, cso, vbuf, 0, PIPE_PRIM_TRIANGLE_FAN, 4, 2); 127 128out: 129 if (vbuf) 130 pipe_resource_reference(&vbuf, NULL); 131 132 if (v) 133 FREE(v); 134} 135